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            <ol class="post-toc"><li class="post-toc-item post-toc-level-1"><a class="post-toc-link" href="#2-3-2-Feign"><span class="post-toc-number">1.</span> <span class="post-toc-text">2.3.2. Feign</span></a><ol class="post-toc-child"><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#Feign介绍"><span class="post-toc-number">1.1.</span> <span class="post-toc-text">Feign介绍</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#Feign示例"><span class="post-toc-number">1.2.</span> <span class="post-toc-text">Feign示例</span></a></li><li class="post-toc-item post-toc-level-2"><a class="post-toc-link" href="#代码地址（任选其一）："><span class="post-toc-number">1.3.</span> <span class="post-toc-text">代码地址（任选其一）：</span></a></li></ol></li></ol>
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            <time class="post-time" title="2017年07月03日 16:23" datetime="2017-07-03T08:23:00.000Z"  itemprop="datePublished">2017-07-03</time>

            
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            <h1 id="2-3-2-Feign"><a href="#2-3-2-Feign" class="headerlink" title="2.3.2. Feign"></a>2.3.2. Feign</h1><h2 id="Feign介绍"><a href="#Feign介绍" class="headerlink" title="Feign介绍"></a>Feign介绍</h2><p>Feign是一个声明式的web service客户端，它使得编写web service客户端更为容易。创建接口，为接口添加注解，即可使用Feign。Feign可以使用Feign注解或者JAX-RS注解，还支持热插拔的编码器和解码器。Spring Cloud为Feign添加了Spring MVC的注解支持，并整合了Ribbon和Eureka来为使用Feign时提供负载均衡。</p>
<blockquote>
<p>译自：<a href="http://projects.spring.io/spring-cloud/docs/1.0.3/spring-cloud.html#spring-cloud-feign" target="_blank" rel="external">http://projects.spring.io/spring-cloud/docs/1.0.3/spring-cloud.html#spring-cloud-feign</a></p>
</blockquote>
<h2 id="Feign示例"><a href="#Feign示例" class="headerlink" title="Feign示例"></a>Feign示例</h2><p>创建一个Maven项目，并在pom.xml添加如下内容：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div><div class="line">17</div><div class="line">18</div><div class="line">19</div><div class="line">20</div><div class="line">21</div><div class="line">22</div><div class="line">23</div><div class="line">24</div><div class="line">25</div><div class="line">26</div><div class="line">27</div><div class="line">28</div><div class="line">29</div><div class="line">30</div><div class="line">31</div></pre></td><td class="code"><pre><div class="line">&lt;?xml version="1.0" encoding="UTF-8"?&gt;</div><div class="line"><span class="tag">&lt;<span class="name">project</span> <span class="attr">xmlns</span>=<span class="string">"http://maven.apache.org/POM/4.0.0"</span> <span class="attr">xmlns:xsi</span>=<span class="string">"http://www.w3.org/2001/XMLSchema-instance"</span></span></div><div class="line">  <span class="attr">xsi:schemaLocation</span>=<span class="string">"http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"</span>&gt;</div><div class="line">  <span class="tag">&lt;<span class="name">modelVersion</span>&gt;</span>4.0.0<span class="tag">&lt;/<span class="name">modelVersion</span>&gt;</span></div><div class="line"></div><div class="line">  <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>microservice-consumer-movie-feign<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></div><div class="line">  <span class="tag">&lt;<span class="name">packaging</span>&gt;</span>jar<span class="tag">&lt;/<span class="name">packaging</span>&gt;</span></div><div class="line"></div><div class="line">  <span class="tag">&lt;<span class="name">parent</span>&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>com.itmuch.cloud<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-cloud-microservice-study<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>0.0.1-SNAPSHOT<span class="tag">&lt;/<span class="name">version</span>&gt;</span></div><div class="line">  <span class="tag">&lt;/<span class="name">parent</span>&gt;</span></div><div class="line"></div><div class="line">  <span class="tag">&lt;<span class="name">dependencies</span>&gt;</span></div><div class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></div><div class="line">      <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.cloud<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></div><div class="line">      <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-cloud-starter-eureka<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></div><div class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></div><div class="line"></div><div class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></div><div class="line">      <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.cloud<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></div><div class="line">      <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-cloud-starter-feign<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></div><div class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></div><div class="line"></div><div class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></div><div class="line">      <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework.boot<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></div><div class="line">      <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-boot-starter-actuator<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></div><div class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></div><div class="line">  <span class="tag">&lt;/<span class="name">dependencies</span>&gt;</span></div><div class="line"><span class="tag">&lt;/<span class="name">project</span>&gt;</span></div></pre></td></tr></table></figure>
<p>启动类：MovieFeignApplication.java</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/**</span></div><div class="line"> * 使用<span class="doctag">@EnableFeignClients</span>开启Feign</div><div class="line"> * <span class="doctag">@author</span> eacdy</div><div class="line"> */</div><div class="line"><span class="meta">@SpringBootApplication</span></div><div class="line"><span class="meta">@EnableFeignClients</span></div><div class="line"><span class="meta">@EnableDiscoveryClient</span></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">MovieFeignApplication</span> </span>&#123;</div><div class="line">  <span class="function"><span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">void</span> <span class="title">main</span><span class="params">(String[] args)</span> </span>&#123;</div><div class="line">    SpringApplication.run(MovieFeignApplication.class, args);</div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>实体类：User.java</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div></pre></td><td class="code"><pre><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">User</span> </span>&#123;</div><div class="line">  <span class="keyword">private</span> Long id;</div><div class="line">  <span class="keyword">private</span> String username;</div><div class="line">  <span class="keyword">private</span> Integer age;</div><div class="line">  ...</div><div class="line">  <span class="comment">// getters and setters</span></div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>Feign测试类：UserFeignClient.java。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div></pre></td><td class="code"><pre><div class="line"><span class="comment">/**</span></div><div class="line"> * 使用<span class="doctag">@FeignClient</span>("microservice-provider-user")注解绑定microservice-provider-user服务，还可以使用url参数指定一个URL。</div><div class="line"> * <span class="doctag">@author</span> eacdy</div><div class="line"> */</div><div class="line"><span class="meta">@FeignClient</span>(name = <span class="string">"microservice-provider-user"</span>)</div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">UserFeignClient</span> </span>&#123;</div><div class="line">  <span class="meta">@RequestMapping</span>(<span class="string">"/&#123;id&#125;"</span>)</div><div class="line">  <span class="function"><span class="keyword">public</span> User <span class="title">findByIdFeign</span><span class="params">(@RequestParam(<span class="string">"id"</span>)</span> Long id)</span>;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>Feign的测试类：FeignController.java</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div></pre></td><td class="code"><pre><div class="line"><span class="meta">@RestController</span></div><div class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">FeignController</span> </span>&#123;</div><div class="line">  <span class="meta">@Autowired</span></div><div class="line">  <span class="keyword">private</span> UserFeignClient userFeignClient;</div><div class="line"></div><div class="line">  <span class="meta">@GetMapping</span>(<span class="string">"feign/&#123;id&#125;"</span>)</div><div class="line">  <span class="function"><span class="keyword">public</span> User <span class="title">findByIdFeign</span><span class="params">(@PathVariable Long id)</span> </span>&#123;</div><div class="line">    User user = <span class="keyword">this</span>.userFeignClient.findByIdFeign(id);</div><div class="line">    <span class="keyword">return</span> user;</div><div class="line">  &#125;</div><div class="line">&#125;</div></pre></td></tr></table></figure>
<p>application.yml</p>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><div class="line">1</div><div class="line">2</div><div class="line">3</div><div class="line">4</div><div class="line">5</div><div class="line">6</div><div class="line">7</div><div class="line">8</div><div class="line">9</div><div class="line">10</div><div class="line">11</div><div class="line">12</div><div class="line">13</div><div class="line">14</div><div class="line">15</div><div class="line">16</div></pre></td><td class="code"><pre><div class="line"><span class="attr">server:</span></div><div class="line"><span class="attr">  port:</span> <span class="number">8020</span></div><div class="line"><span class="attr">spring:</span></div><div class="line"><span class="attr">  application:</span></div><div class="line"><span class="attr">    name:</span> <span class="string">microservice-consumer-movie-feign</span></div><div class="line"><span class="attr">eureka:</span></div><div class="line"><span class="attr">  client:</span></div><div class="line"><span class="attr">    serviceUrl:</span></div><div class="line"><span class="attr">      defaultZone:</span> <span class="attr">http://discovery:8761/eureka/</span></div><div class="line"><span class="attr">  instance:</span></div><div class="line"><span class="attr">    preferIpAddress:</span> <span class="literal">true</span></div><div class="line"><span class="attr">ribbon:</span></div><div class="line"><span class="attr">  eureka:</span></div><div class="line"><span class="attr">    enabled:</span> <span class="literal">true</span>         <span class="comment"># 默认为true。如果设置为false，Ribbon将不会从Eureka中获得服务列表，而是使用静态配置的服务列表。静态服务列表可使用：&lt;client&gt;.ribbon.listOfServers来指定。参考：http://projects.spring.io/spring-cloud/docs/1.0.3/spring-cloud.html#spring-cloud-ribbon-without-eureka</span></div><div class="line">    </div><div class="line"><span class="comment">### 参考：https://spring.io/guides/gs/client-side-load-balancing/</span></div></pre></td></tr></table></figure>
<p>同样的，启动该应用，多次访问<a href="http://localhost:8020/feign/1" target="_blank" rel="external">http://localhost:8020/feign/1</a>，我们会发现和Ribbon示例一样实现了负载均衡。</p>
<h2 id="代码地址（任选其一）："><a href="#代码地址（任选其一）：" class="headerlink" title="代码地址（任选其一）："></a>代码地址（任选其一）：</h2><p>Feign代码地址：</p>
<blockquote>
<p><a href="http://git.oschina.net/itmuch/spring-cloud-study/tree/master/microservice-consumer-movie-feign" target="_blank" rel="external">http://git.oschina.net/itmuch/spring-cloud-study/tree/master/microservice-consumer-movie-feign</a><br><a href="https://github.com/eacdy/spring-cloud-study/tree/master/microservice-consumer-movie-feign" target="_blank" rel="external">https://github.com/eacdy/spring-cloud-study/tree/master/microservice-consumer-movie-feign</a></p>
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